Studies on the Characteristics of Mineral Diluents Affecting the Decomposition of Sumithion in the Dust formulations

Sumithion 분제의 성분 변화에 영향을 미치는 증량제의 특성에 관한 연구

  • Wuh K. D. (Institute of Plant Environment, O.R.D.) ;
  • Han S. S. (Institute of Plant Environment, O.R.D.) ;
  • Keum S. S. (Institute of Plant Environment, O.R.D.) ;
  • Ahn S. H. (College of Agriculture, S.N.U.) ;
  • Lee C. N. (College of Agriculture, S.N.U.)
  • 우기대 (농촌진흥청 식물환경연구소) ;
  • 한성식 (농촌진흥청 식물환경연구소) ;
  • 금소승 (농촌진흥청 식물환경연구소) ;
  • 안신훈 (서울대학교 농과대학) ;
  • 이춘영 (서울대학교 농과대학)
  • Published : 1971.10.01

Abstract

In order to find out the decomposing factors of Sumithion in mineral diluents, the physical and chemical properties of the diluents such as talcs, bentonites, diatomaceous earth and other clay minerals was studied in relation to the decomposition rate of Sumithion in dust formulations. The total base, moisture adsorption capacity, pH, specific surface, water contents, active $Fe^{++}$, ignition loss and cation exchange capacity were analysed as the properties of mineral diluents, and these properties were correlated with the stability of Sumithion in dust formulations. And in hope of finding out the main factors among those properties of diluents, the decomposed products of Sumithion in dust formulations prepared with standard Sumithion were separated by the methods of column chromatography and investigated by thin layer chromatography. The following results were otbained; 1. The total base, moisture adsorption capacity, specific surface, water contents, active $Fe^{++}$ and cation exchange capacity of mineral diluents were found to be highly effective on the rate of decomposition of Sumithion in dust formulations. 2. Decomposed products of Sumithion in dust formulations were found to be dimethylphosphorothionate, 3-methyl-4-nitro phenol and its derivatives. And one fraction was not dissolved in n-hexane and ethylether, but was soluble in methylalcohol and ethylalcohol. 3. The moat highly correlated properties of diluents with the decomposition rate of Sumithion in dust were found to be the total base and water contents. 4. In regard to the kind of diluents, it was found that the rate of decomposition of Sumithion in dust formulations was higher in order of bentonite, diatomaceous earth, kaolin and talc.

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